KR101250745B1 - Measurement Apparatus for hotosynthetic photon flux density - Google Patents

Measurement Apparatus for hotosynthetic photon flux density Download PDF

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KR101250745B1
KR101250745B1 KR1020100115575A KR20100115575A KR101250745B1 KR 101250745 B1 KR101250745 B1 KR 101250745B1 KR 1020100115575 A KR1020100115575 A KR 1020100115575A KR 20100115575 A KR20100115575 A KR 20100115575A KR 101250745 B1 KR101250745 B1 KR 101250745B1
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photosynthetic effective
unit
photosynthetic
effective light
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KR1020100115575A
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KR20120054277A (en
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박경섭
권준국
이한철
조명환
최경이
유인호
강윤임
박춘덕
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박춘덕
대한민국(농촌진흥청장)
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  • General Physics & Mathematics (AREA)
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Abstract

The present invention relates to a photosynthetic effective light quantity measuring device, using a photosynthetic effective photon sensor using a photodiode, measuring an accurate photosynthetic effective light amount according to a light source through a correction value according to a light source, and measuring a variable resistance member of the photosynthetic effective photon sensor. By adjusting the resistance value and adjusting the correction value, it is easy to calibrate the sensor periodically during long-term use.

Figure R1020100115575

Description

Photosynthetic effective light meter {Measurement Apparatus for hotosynthetic photon flux density}

The present invention relates to a photosynthetic effective light quantity measuring device, and more particularly, to invent the photosynthetic effective light amount accurately for each light source through a correction value according to a light source.

In general, in plant cultivation of plants under controlled conditions, such as in greenhouses, growth cabinets or warehouses, it is important to adjust the microclimate of the environment to optimize plant growth and photosynthesis.

In plant cultivation, a large number of pyranometers with a response curve of 300 to 1100 nm are used outside the greenhouse to measure the light environment.

However, the wavelength region used by plants for photosynthesis is 400 to 700 nm as shown in FIG. 1, and is represented by the photosynthetic photon flux density (umol / s / m) of photosynthetic photon flux density (PPFD). There was a problem that it is difficult to accurately measure and monitor the light environment of plant cultivation because it does not match the photosynthetic effective light amount region.

There is a photosynthetically active radiation (PAR) sensor for measuring the photosynthetic effective light amount, but most of them are imported and have a high price.

In addition, the conventional photosynthetic effective photon (PAR) sensor is required to be calibrated due to deterioration of durability and external environment change according to the external environment at regular intervals of about 2 years for a certain period of time. Similarly, although different coefficients are required for each light source, there is no information, which makes it difficult to accurately measure the photosynthetic effective light amount for each light source.

An object of the present invention is to measure the photosynthetic effective light quantity according to the light source, and to change the input environment change and correction value, the photosynthetic effective light quantity meter which can calibrate the measured value of photosynthetic effective light amount according to each light source or sensor state. To provide.

The object of the present invention is a photosynthetic effective photon sensor having a photodiode for converting light energy into electrical energy to convert the light energy into electrical energy and outputs;

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A data conversion device coupled to the photosynthetic effective photon sensor and converting and displaying electrical energy output from the photosynthetic effective photon sensor into the photosynthetic effective photon sensor value,

The data conversion device includes: a photosynthetic effective light amount calculating unit configured to calculate a photosynthetic effective light amount by multiplying a correction value for each light source per mV output from the photosynthetic effective photon sensor;

This is solved by providing a photosynthetic effective light quantity meter including a main display unit for displaying the photosynthetic effective light amount calculated by the photosynthetic effective light amount calculating unit.

The present invention can accurately measure the photosynthetic effective light amount for each light source, and has an effect of simplifying the calibration operation of the sensor.

The present invention has the effect of improving the reliability of the measured value of the photosynthetic effective light amount by maintaining constant durability, reaction rate, accuracy for a long time.

1 is a graph showing the wavelength range of light that plants use a lot of photosynthesis
Figure 2 is a perspective view showing a photosynthetic effective photon sensor of the present invention
3 is a schematic diagram showing the structure of the present invention;
Figure 4 is a block diagram showing a photosynthetic effective light amount meter of the present invention
5 is a graph showing a response curve according to photodiode size
6 is a graph showing the spectral curve of the sunlight measured by the spectrometer

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The photosynthetic effective photon sensor 100 of the present invention includes a photodiode for converting light energy into electrical energy and a substrate member 20 on which the photodiode 10 is mounted.

The substrate member 20 is a printed circuit board (PCB) and has an electrical circuit for outputting electrical energy converted by the photodiode 10 through a connected wire.

The photodiode 10 converts light energy into electrical energy, enhances blue light sensitivity, and attaches an acrylic filter having infrared and ultraviolet ray blocking properties to improve response characteristics in an optical wavelength range of 330 to 720 nm. It is preferred that the PN junction silicon planar photodiode has an excitation.

The photodiode 10 preferably has a size of 1.0 mm 2 or more, and in the present invention, the size of the photodiode 10 is 1.6 mm 2 .

As shown in FIG. 5 of the present invention, the measured value of the photosynthetic effective photon sensor 100 may be checked according to the size of the photodiode 10 and the angle of the light source, but having a size of 1.0 mm 2 or more has a certain value of stability. It can be seen that the stability of the measured value according to the angle of the light source can be satisfied.

The photodiode 10 has an optimal response to visible light, has a low shift with respect to a constant light, has a very low current value in a dark state, shows stability, has a fast response speed of 1 us, and has a very long service life. It has a linearity of 1%, has stability of measured values, and has properties that can be used stably in a wide temperature range of -20 ° C to 75 ° C.

According to the present invention, a concave portion 41 is formed on an upper surface of the substrate member 20 on which the photodiode 10 is mounted, and a space for wiring wires is formed in the sensor housing member 40. Wow;

It is preferable to further include a sensor cover member 50 mounted on the recess 41 of the sensor housing member 40 to selectively transmit light.

The sensor cover member 50 is preferably an acrylic panel that transmits light except for a wavelength region of 300 nm or more and less than 400 nm. The sensor cover member 50 may be processed by a laser to cover and seal the recess 41 so that the sensor cover member 50 may be closed. Seal the inside to maintain the waterproof structure.

In addition, the substrate member 20 includes a variable resistance member 30 for correcting the electric energy value detected and output by the photodiode 10.

The variable resistance member 30 includes an adjusting screw part 31 for adjusting the resistance value by moving to correct the resistance value of the substrate member 20, that is, the value of electrical energy output from the substrate member 20. It can be.

The photosynthetic effective photon sensor 100 of the present invention includes the photodiode 10 and the substrate member 20 on which the photodiode 10 is mounted. As the energy output changes, it is necessary to calibrate the output periodically.

The photosynthetic effective photon sensor 100 of the present invention can vary the resistance value through the variable resistance member 30, so that the sensor of the present invention has not been used for a long time, that is, the newly manufactured photosynthetic effective photon sensor 100 of the present invention or international As a reference light source for the reliable LI-COR PAR sensor, it is possible to perform periodic calibration work by comparing it with the reference value through standard light quantity measurement.

The sensor housing member 40 is provided with a base portion 42 is a flat bottom surface on the bottom, the horizontal surface 60 to check the horizontal state of the photodiode 10 on the upper surface of the base portion 42 Is preferably mounted.

The level meter 60 can accurately level the photodiode 10 by checking the horizontal state of the photodiode 10 to improve measurement accuracy.

In addition, the sensor housing member 40 is preferably provided with a plurality of height adjustment port 43 is capable of height adjustment to protrude in the lower portion.

The sensor housing member 40 is capable of individual height adjustment at each point provided with the height adjusting holes 43 by adjusting the height adjusting holes 43 provided in plurality, that is, the floor where the present invention is installed. The level of the photodiode 10 can be easily adjusted while checking the level 60 by adjusting the height at each point according to the state of.

The height adjusting port 43 is fastened so as to penetrate from the upper part of the support part 42 to the lower part, and has a height adjusting screw 43a having a head on the upper part, a head of the height adjusting screw 43a, and the supporting part. It is disposed between the upper surface of the portion 42 includes a support spring (43b) for elastically supporting the height adjustment screw (43a).

The height adjusting screw 43a is capable of adjusting the height at each of the fastened points by varying the length of the height adjusting screw 43 depending on the direction in which the height is adjusted.

In addition, the height adjusting screw 43a is elastically supported by the support spring 43b after adjusting the height at each mounted point to prevent loosening.

In addition, the present invention includes a connector member 44 mounted to the sensor housing member 40 and connected to the substrate member 20 through an electric wire.

The connector member 44 is connected to the photosynthetic effective photon sensor 100 and converts and displays the electrical energy output from the photosynthetic effective photon sensor 100 into the photosynthetic effective photon sensor 100 and displays the data conversion device 200. ) Is a connector for connection.

The connector member 44 uses a waterproof connector that seals the inside of the sensor housing member 40, so that water or moisture is introduced into the sensor housing member 40 when the device is used outdoors. It is preferable to prevent the malfunction of) and to be able to use stably in the open air.

The photosynthetic effective light quantity meter of the present invention further includes a data conversion device 200 connected to the photosynthetic effective photon sensor 100 and converting and displaying the electrical energy output from the photosynthetic effective photon sensor 100 into the photosynthetic effective light quantity value. will be.

The data conversion device 200 is connected to the photosynthetic effective photon sensor 100 through the connector member 44 as described above.

The data conversion device 200 includes: a photosynthetic effective light amount calculating unit 210 for calculating a photosynthetic effective light amount PPDF by multiplying a correction value per light source per mV output from the photosynthetic effective photon sensor 100;

And a main display unit 220 for displaying the photosynthetic effective light amount calculated by the photosynthetic effective light amount calculating unit 210.

In addition, the photosynthetic effective light amount calculating unit 210 calculates the photosynthetic effective light amount by multiplying the correction value for each light source by the voltage value (mV) output from the photosynthetic effective photon sensor 100. The light is 4.81umol / s / m 2 per mV, and the three wavelength fluorescent lamp is 5.26umol / s / m 2 per mV.

The correction value is obtained by obtaining a spectral curve of a corresponding light source with a spectrometer, and then calculating a photosynthetic photon flux density (umol / s / m 2 ) value using the spectral curve, and calculating the photosynthesis for the corresponding light source. This value is obtained using the effective light quantity value.

For example, a solar spectral curve of 400-1100 nm was obtained using a spectrometer LI1800 spectroadimeter (LI-COR) in FIG. 6.

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In addition, the data conversion device 200 may further include a correction value input unit 230 capable of correcting and inputting a correction value of the photosynthetic effective light amount calculating unit 210.

The correction value input unit 230 may re-enter and set a correction value for each light source to obtain an accurate photosynthetic photon flux density (umol / s / m 2 ) value according to each light source. The correction value may be corrected and input according to a state of the photosynthetic effective photon sensor 100, that is, a state change caused by long-term use.

The correction value input unit 230 includes a correction value display unit 231 for displaying a correction value, and a keypad unit 232 for inputting and correcting the correction value.

The keypad unit 232 includes a correction value adjustment button 232a for adjusting the correction value, and an input button 232b for inputting and storing the adjusted correction value to the photosynthetic effective light amount calculating unit 210.

That is, the correction value of the photosynthetic effective light amount calculating unit 210 is operated by the operator adjusting the correction value adjusting button 232a while checking the correction value displayed on the correction value display unit 231 and then correcting the correction value. Press 232b to enter it.

The photosynthetic effective photon sensor 100 includes the photodiode 10 and the substrate member 20 on which the photodiode 10 is mounted. As the output value changes, it is necessary to calibrate the output value periodically.

The photosynthetic effective light quantity meter of the present invention may not only change the resistance value of the photosynthetic effective photon sensor 100 through the variable resistance member 30, but also may correct and input the correction value so that the photosynthetic effective photon sensor 100 may be corrected. ) Is compared to the reference value through the standard light quantity measurement as a reference light source for the unused sensor of the present invention, that is, the newly manufactured photosynthetic effective photon sensor 100 or the internationally reliable LI-COR PAR sensor, which is not used during long-term use. Corrective work is possible.

In addition, the present invention preferably further includes a data logger 300 connected to the data conversion device 200 and storing operation data of the photosynthetic effective light amount calculating unit 210.

The data logger 300 stores a basic correction value according to each light source, stores reference photosynthesis effective light quantity data according to a standard light quantity, and corrects a correction value based on the reference photosynthesis effective light quantity data when correcting the correction value. It may be possible.

The data conversion device 200 includes a sensor connector member 240 connected to the photosynthetic effective photon sensor 100 and a logger connector member 250 connected to the data logger 300.

The sensor connector member 240 and the logger connector member 250 can be easily connected and separated in a one-touch manner with a push connection structure.

The data conversion device 200 is connected to the photosynthetic effective light quantity calculating unit 210 and the main display unit 220 and selects one of the photosynthetic effective light quantity value and the voltage value output from the photosynthetic effective photon sensor 100. The display further includes a display switching unit 260 to be displayed on the main display unit 220.

The display switching unit 260 includes a switching switch 261 that selects the photosynthetic effective light quantity value and the voltage value output from the photosynthetic effective photon sensor 100 on the main display unit 220.

The user may operate the changeover switch 261 to select and confirm the photosynthetic effective light quantity value and the voltage value output from the photosynthetic effective photon sensor 100 on the main display unit 220.

In addition, the data conversion device 200 is connected to the photosynthetic effective light amount calculating unit 210 and the main display unit 220 and has a built-in unit conversion formula for each light source to convert the photosynthetic effective light quantity into a selected light source unit to convert the main display unit. It is preferable to further include a unit converter 270 displayed at 220.

An example of a unit conversion table for each light source is shown in Table 1 below, and the unit conversion unit 270 converts units using the unit conversion table of Table 1 as an example.

Light source sunlight Red LED (660 nm) Metal Halide Lamp High pressure sodium lamp 1W / m 2 a few μmol / s / m 2 per 2.52 5.46 2.99 3.30 Several lux per 1μmol / s / m 2 56.3 12.3 76.4 79.4

The unit converting unit 270 includes a converter key 271 for converting and displaying each converted unit, and operates the converter key 271 to a required unit, for example, W or lux, in the main display unit 220. By converting the display, the user can confirm.

The photosynthetic effective light quantity measuring device of the present invention can simplify the calibration operation to accurately measure the photosynthetic effective light quantity value as described above, and to accurately display the photosynthetic effective light quantity value during long-term use of the photosynthetic effective photon sensor 100. In addition, the amount of light can be displayed in various units so that the user can accurately and stably check the light environment in the facility cultivation.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention, which is understood to be included in the configuration of the present invention.

10: photodiode 20: substrate member
30: variable resistance member 40: sensor housing member
50 sensor cover member 60 level
100: photosynthetic effective photon sensor 200: data conversion device
210: photosynthetic effective light amount calculating unit 220: main display unit
230: correction value input unit 240: sensor connector member
250: logger connector member 260: display switching unit
270 unit conversion unit

Claims (18)

delete delete delete delete delete delete delete delete delete A photosynthetic effective photon sensor having a photodiode for converting light energy into voltage and converting light energy into voltage and outputting the light energy;
A data conversion device connected to the photosynthetic effective photon sensor and converting and displaying a voltage value output from the photosynthetic effective photon sensor into a photosynthetic effective amount of light,
The photosynthetic effective photon sensor,
A substrate member on which the photodiode is mounted;
A variable resistance member connected to the substrate member,
Adjusting the resistance value of the variable resistance member to correct the voltage value detected and output by the photodiode,
The data conversion device,
A photosynthetic effective light amount calculating unit configured to calculate a photosynthetic effective light amount by multiplying a voltage value output from the photosynthetic effective photon sensor by a preset correction value for each light source;
A main display unit displaying the photosynthetic effective light amount calculated by the photosynthetic effective light amount calculating unit;
And a correction value input unit for correcting and inputting a correction value of the photosynthetic effective light amount calculating unit. delete delete delete The method of claim 10,
And a data logger connected to the data conversion device, the data logger storing operation data of the photosynthetic effective light amount calculating unit. The method according to claim 14,
And said data conversion device comprises a sensor connector member connected to said photosynthetic effective photon sensor and a logger connector member connected to said data logger. The method according to claim 15,
The sensor connector member and the logger connector member is a photosynthetic effective light meter, characterized in that the connection can be easily connected and disconnected in a one-touch manner by a push connection structure. The method of claim 10,
The data conversion device,
And a display switching unit connected to the photosynthetic effective light quantity calculating unit and the main display unit and selecting one of the photosynthetic effective light quantity and the voltage value to display on the main display unit. 18. The method of claim 17,
The data conversion device,
And a unit converting unit connected to the photosynthetic effective light amount calculating unit and the main display unit to convert the photosynthetic effective light amount into a selected unit by incorporating a unit conversion formula for each light source, and displaying the converted value on the main display unit. Photosynthetic effective light meter.
KR1020100115575A 2010-11-19 2010-11-19 Measurement Apparatus for hotosynthetic photon flux density KR101250745B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105424175A (en) * 2015-11-16 2016-03-23 北京师范大学 Observation device for photosynthetic active radiation and narrowband radiation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103148934B (en) * 2013-01-24 2014-08-06 西北农林科技大学 Detection method and equipment based on solar single-band photon flux density model
JP5575951B1 (en) * 2013-05-08 2014-08-20 株式会社日本医化器械製作所 Spectral photosynthetic photon flux density distribution observation method, photonometer used in this method, and photosynthetic photon flux density measurement program
KR102430150B1 (en) * 2020-08-25 2022-08-08 서울대학교산학협력단 Spectroscopic sensor circuit for monitoring vegetation and smart spectroscopic sensor including thereof

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JPH07151604A (en) * 1993-11-30 1995-06-16 Matsushita Electric Ind Co Ltd Luminous radiation measuring instrument
KR0135119B1 (en) * 1988-08-12 1998-04-20 앤. 라이스 머레트 Infrared detector
JP2000182263A (en) * 1998-12-14 2000-06-30 Konica Corp Photo-detecting device, and device for detecting quantum wobbling level of light beam and wobbling of light intensity
JP2003065844A (en) * 2001-08-24 2003-03-05 Tomohiro Yanagi Illumination photometer using light emitting diode as photoreceiving element

Patent Citations (4)

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KR0135119B1 (en) * 1988-08-12 1998-04-20 앤. 라이스 머레트 Infrared detector
JPH07151604A (en) * 1993-11-30 1995-06-16 Matsushita Electric Ind Co Ltd Luminous radiation measuring instrument
JP2000182263A (en) * 1998-12-14 2000-06-30 Konica Corp Photo-detecting device, and device for detecting quantum wobbling level of light beam and wobbling of light intensity
JP2003065844A (en) * 2001-08-24 2003-03-05 Tomohiro Yanagi Illumination photometer using light emitting diode as photoreceiving element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105424175A (en) * 2015-11-16 2016-03-23 北京师范大学 Observation device for photosynthetic active radiation and narrowband radiation

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